Process and product of electric welding



E. FULDA.

PROCESS AND PRODUCT 0F ELECTRIC WELDING. APPLICATION FILED NOV. 23, I918.

Patented June 22, 1920.

IWEA/TOI? ,Zcfluqr 0/ EDWARD ICE.-

FULDA, OF'NEW YORK, N. Y.

,IPROCESS AND PRODUCT 0F ELECTRIC WELDING.

Specification of Letters mat;

Patented June-22,1920.

Application filed November 23, 1918. Serial No. 265,802.

To all whom it may concern:

Be it known that I, EDWARD FULpA, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Processes and Products of Electric Welding, of which the following isa specification.

My present invention relates to a process" of electrically welding two sheet metal parts face to face and from such process.

The object of the invention is to join the to. the product resulting parts quickly and secure a strong, smooth union with the use of an exceedingly small amount of current.

The invention is particularly adapted for welding the bail-ears, spouts or other pro- .jecting parts {to sheet metal cooking or similar utensils as the process is practised so quickly and consumes such a smallquantity of currentthat the cost is exceedingly low and a smooth joint is obtained which does not interfere with the coating of enamel usually applied as a finish to the utensil.

e invention consists in the improved process of electrically welding sheet metal parts and in the product resulting therefrom, all as moreparticularly hereinafter described and then specified in the claims.

In the accompanying drawings:

Figure 1. is a side elevation of a cookin utensil constructed in accordance with this invention.

Fig. 2 is a similar view taken at right angles to that shown in Fig. 1.

Fig. 3 is an enlarged cross-section taken on the line 33 of Fig. 1. i

Fig. 4 is an enlarged longitudinal crosssection through a bail-ear formed in accordance 'with this invention.

Fig. 5 is a fragmentary view showing the parts assembled between the current supplying contact-blocks or electrodes of an electric welding machine.

Fig. 6 is a similar view at the end of the welding operation.

Figs. 7 and 8 are front elevation and longitudinal section through a bail-ear of a modified form.

the bail-ear usually body of the utensil formed of sheet metal in any desired manner and provided with the usual reinforcing edge 2. 3 indidates of heavier gage metal and which is formed, at least as regards that part which is body,.in a special manner to adapt it to be quickly and economically welded to the side of the utensil. which shown an acute'angle with the surface of the utensil andcontact therewith only along a sharp corner when the two parts are brought in contact. The upper part of the ear is by preference flat and bent outwardly to clear the reinforced edge 2 although if desired the greater part or the whole length of the par may be convex in transverse cross-sec- After being so prepared the ear 3 and utensil 1 are assembled face to face between current supplying blocks 6, 7 the edges 5 making a line contact with the surface of The part of the bail-ear engages the body is convexed) as the utensil.

The contact blocks 6 and 7 form the terminals of the secondary of a transformer 8-a'nd are embodied as art'of an electric welding machine of any esired and suitable construction as will be readily understood by those skilled in the art. The lower block 7 forms a seat for the work and the upper block 6 is provided with aconcave groove 9 preferably of sharper curvature than the part 4 of the ear and of slightly less width so that when brought down on the ear it will only make contact with it directly. in back of the corners of the car which contact with the surface of the .The invention is illustrated and will be.

Referring to the drawings,- 1 indicates the utensil.

Upon passage of the current from one contact block to the other across the con tacted portions of the 'ear 4' and utensil 1, such contacted parts immediately reach a welding heat owing to the extremely narrow contact formed by the corner edge of the ear and upon the application of pressure by means of the block 6 the side edges sink into the wall of the utensil and become welded thereto as indicated in Figs. 3 and 6. A weld so made is practically instantaneous and may be termed a flashweld. As the current passes onlyan exceedingly small fraction of time but little current is consumed. The resultant weld between the parts makes a smooth surface with the utensecured to the utensil at 4' so that its side edges 5 form sil and does not present an sharp edges or in back of the line contact, passing an eleccorners to interfere with tie proper enamtric current through the pieces and apply eling of the utensil. ing pressure whereby the pieces are welded In the form shown in Figs. 1 to 6 intogether along said edge.

clusive, an open passage between the ear 3. The process of electrically welding two and the utensil body is provided but if it is pieces of sheet metal face to face, consisting .desired to'form a pocket closed at the bot in deforming one of the pieces so that the tom, the formflof the car may be modified side edges contact with the other piece at as shown in Figs. 7 and 8. In this form the corner of said edges only, applying an the lower edge of the ear is also curved electrode having a grooved contact face of inwardly at 10 resulting in a sharp corner sharper curvature than the deformed piece 11 which contacts with and welds to the to said piece and whereby said electrode body of the utensil in the same manner and only contacts with said piece directly in operation as the edges 5. back of the contacting edges and electrically It will be understood that the invention uniting said parts by a flash weld along said is not limited to the particular use described edges. but is of general application in the arts. 4. A new article of manufacture comprishat I claim as my invention is 2-- ing a piece of sheet metal having a convex 1. Process of electrically welding an ear part welded to another metal sheet along the or other sheet metal part to a metal body edges of the convex part. consisting in deforming the ear or part so 5, A sheet metal utensil having a bail-car that a corner only of the edges will engage or other projecting part provided with a the body and make a line contact therewith, convex portion welded by its edges to the applying an electrode contacting with the body of the utensil. ear only in back of the contacting edge, 6. A sheet metal utensil having a bail-ear v passing an electric heating current across provided with a convex portion, t ie edges of said line contact and applying pressure to which are embedded in and welded to the weld the ear to the body along said edges. body of the utensil.

2. The process of electrically welding two Signed at New York, in the county of 5\ pieces of sheet metal face to face, consisting New York and State of New York, this 21st in deforming one of the pieces so that a corday of November, A. D. 1918.

ner of the edge is presented to the other piece, contacting said pieces so that one EDWARD FULDA' makes a line contact with the other, apply- I -Witnesses: ing a heating electrode to one of said con- C. F. TISCHNER, tacts but only making contact with said part GEORGE E. BROWN. 

